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There is no drain plug. For the leaks be certain to investigate: sunroof drains, taillight seals, and the trunk seal. Many trunk seals actually channel water into the trunk. New designs are available on many GMs.
Aftermarket stuff is not "required" to be water proof.. only "cool"..
You might try silicone sealant to fill any gaps around the tail light...
...You need two people ... check at night for leak points,...YOU get in the trunk....(MAKE SURE YOU DO NOT TAKE THE KEYS WITH YOU INTO THE TRUNK!!)..,, have someone else use a flashlight to shine ALL around the lights to pinpoint the leak points..also check the entire trunk sealing area... its easy to see the light shining through where water leaks...
there are ussually rubber plugs in the bottom,if not use shop vac to remove water and fix leak check antenna if its metal and at the rear panel,other areas to check are the rear tail light gaskets.also look at tail mounting holes.
U need to carefully check the seams of the sheetmetal for any sign of water or dirt from the road, there is no common leak on these cars, in fact they seldom leak anywhere, the water is most likely splash up from the road, unless u left something out like it was sitting when this water accumulated. Let me know that info.
I'm not sure how you know the weatherstrip isn't leaking,here's what i would do.With a trusted helper,get in the trunk and latch it.Have the helper spray the entire trunk area with a garden hose while you watch for any water leaks.That's the best way to check the weatherstrip for leaks,and it is likely that's where the leak is coming from.